The Performance of Low Air-Entraining Polycarboxylate Superplasticizer

Abstract:

A new low air-entraining polycarboxylate superplasticizer (denoted as L-PCE) was synthesized by using oxirane/epoxypropane (denoted as EO/PO) block-polyether as one of monomers. The molecular structure of EO/PO block-polyether monomer was characterized by proton nuclear magnetic resonance spectroscopy (denoted as ¹H NMR). The pore parameters, workability, and compressive strength of the concrete added with L-PCE were compared to that added with conventional polycarboxylate superplasticizer (denoted as G-PCE) or the G-PCE compounding with defoaming agent. The results demonstrate that the air entraining performance of the L-PCE has been greatly improved than the G-PCE and the G-PCE compounding with defoaming agent. Then the problems, which the workability and slumps of fresh concrete decrease when G-PCE compounding with defoaming agent are added, can be solved. What is more, the interior pore structure of concrete has been optimized. The spacing factor of hardened concrete added with the L-PCE is 27% lower than that added with the G-PCE compounding with defoaming agent. And the 28d strength of the concrete added with the L-PCE is 10% higher than that added with the G-PCE compounding with defoaming agent.

• Periodical: Advanced Materials Research (Volume 1129)
• Pages: 361-366
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1129.361
• Online since: November 2015
• Authors: Nan Li, Bei Ding
• Keywords: Concrete Performance, Eo Po Block Polyether Monomer, Low Air-Entrainment, Polycarboxylate Superplasticizer

References

[1] YANG Jian-ying, Sven M.F. Asmus , Study and application of PCE-based admixture on pre-cast concrete, Concrete,V. 05, 2005, pp.97-100.

[2] Qianping Ran, Youkun You, Bei Ding, Low air-entraining high efficiency polycarboxylate superplasticizer preparation and properties study, New Building Materials,V. 06, 2003, PP. 33-35.

[3] Gang Zheng, Rumin Wang, Hongjun Wang, Yanli Xiong, Yunfang Wang, Experiment study of a new class polycarboxylic series of superplasticizer PCS, Materials Review,V. 03, 2006, pp.146-148.

[4] Ziming Wang, Huiqun Li, The study and the new progress application of polycarboxylate superplasticizer, China Concrete,V. 08, 2012, PP. 50-56.

[5] Jiangwei Xu, Compounding of defoamers and probing into deforming mechanisms, China Beet & Sugar,V. 04, 2002, pp.31-34.

[6] Qi Wang, Hailing Xi, Yanjun Zuo, Review on measurement techniques of performance and influence factors of stability for foam, J. Chem. Industry & Engineering,V. 28, 2007, pp.25-29.

[7] WEI Jun fu, SUN Bo quan, XU Jin yun, WANG Ping, Study of properties of butyl copolyether with different chain structure, Fine Chemicals,V. 19, 2002, pp.60-62.

[8] Ziqian Wang, Review of low-foaming surfactant, Cleaning World,V. 30, 2014, pp.38-43.